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Finding the Fourth Proportional to 780.84, 1,075.68 and 724.68

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Solution

The fourth proportional to 780.84, 1,075.68 and 724.68 is: 998.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.84 : 1,075.68 = 724.68 : x
  2. Step 2: Convert to fraction form
    780.84/1,075.68 = 724.68/x
  3. Step 3: Cross multiply
    780.84x = 1,075.68 × 724.68
  4. Step 4: Simplify right side
    780.84x = 779,523.78
  5. Step 5: Solve for x
    x = 779,523.78/780.84
  6. Step 6: Final answer
    x = 998.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.